Plug-in type immersible pump



Aug. 11, 1964 J. A. GREEN 3,143,971

PLUG-IN TYPE IMMERSIBLE PUMP Original Filed Dec. 23, 19 57 2Sheets-Sheet 1 F9 w m 36 642 25, 5... 75 5% r- 25 a g g I I i 47 a v I\fa/uz, Q. Greng- 11, 1964 J. A. GREEN 3,143,971

PLUG-IN TYPE IMMERSIBLE PUMP Original Filed Dec. 23, 1957 2 Sheets-Sheet2 {/I M p 4.9 H a? F K II 11 I I Z5 I II II I I I Ii l 1| frwrzzar'"\fbkn a. Green,

United States Patent Ofice 3,143,971 Patented Aug. 11, 1 964 3,143,971PLUG-EN TYPE IMMERSIBLE PUMP John A. Green, Venice Calif, assiguor toBorg-Warner Corporation, Chicago, Ill., a corporation of Illinois@riginal application Dec. 23, 1957, Ser. No. 704,626, now Patent No.3,064,340, dated Nov. 20, 1962. Divided and this application Aug. 24,1962, Ser. No. 225,953 2 Claims. (Cl; 103 -87) The present applicationis a division of Serial No. 704,626, now US. Patent Number 3,064,340which was filed December 23, 1957.

This invention relates to a fluid pump assembly, and more particularlyto a pump including a scroll member adapted to telescopically receive animpeller portion of a motor and impeller assembly.

In aircraft, fuel booster pumps are normally mounted within a fuel tanklocated remote from the aircraft engines and are adapted to force a flowof fuel from within the fuel tank through the pumping means thereof,which increases the fluid pressure of the fuel, to an outlet lineleading to another fuel pump mounted adjacent the particular enginewhich is to be supplied with the fuel. Since it is desirable to have thebooster pump assembly mounted Within the fuel tank where the inlet tothe booster pump assembly is maintained at the lowest possible positionwithin the fuel level of the tank, access means must be provided to theinterior of the fuel tank when repairs or normal time inspections are tobe made on the booster pump assembly. In normally constructed boosterpumps the impeller assembly is usually formedintegrally with the motorassembly forming a separate impeller and motor assembly or cartridgewhich is adaptedto be telescopically received within a pump scroll orshroud assembly and fastened thereto by a plurality of bolts whereby theim peller portion of the assembly is suitably disposed within the pumpscroll or shroud. The pump scroll or shroud'is provided with the inletand outlet means of the pump assembly. Since the impeller and motorassembly contain the majority of moving parts of the booster pumpassembly and repairs are normally needed therefor rather than for thescroll, the pump scroll or shroud is mounted within the interior of thefuel tank and the cartridge or impeller and motor assembly is fastenedthereto in such a manner that the impeller and motor assembly can beunfastened therefrom and removed for the necessary repairs and/orinspection. Another impeller and motor assembly is fastened to the pumpscroll permitting use of the aircraft while the necessary repairs arebeing made on the replaced cartridge.

As previously stated, the cartridge or motor and impeller assembly isbolted to the pump scroll or shroud and when it becomes necessary toremove the motor and impeller assembly the fuel tank must be drained offuel or at least have the liquid level thereof lowered below the boltfastening means whereby the mechanic or workman will be able to see whathe is doing when reaching through the access opening in the fuel tank torelease the bolt fastening means. The access opening is either formed inthe top of the fuel tank or in the side thereof. Obviously, if theaccess opening is formed in the side of the fuel tank, the fuel thereinmust be drawn off be low the level of the opening. It can readily beseen that there are many disadvantages to this prior arrangement notonly in the time involved in draining the liquid fuel from the fuel tankand storing same, but also in unfa stening several bolts which arelocated in very awkward or hard to get at places,

Therefore, it is an object of this invention to provide a fluid pumpassembly where the impeller and motor assembly iseasily unfastened orfastened to the pump scroll assembly mounted within a liquid storagetank.

It is another object of this invention'to provide a fluid pump assemblyWhere the impeller and motor assembly is easily fastened to orunfastened from a pump scroll or shroud mounted within a liquid storagetank without emptying the liquid contained therein.

Another object of this invention is to provide means for fastening andunfastening an impeller and motor assembly of a boosterpump, where theimpeller and motor assembly has externally mounted tongue portions, froma pump scroll or shroud having grooved portions formed thereon which areadapted to receive the tongue portions and retain the tongue portionswithin the grooved portions by detent means whereby the tool is adapted,when it is desired to fasten the assembly to the pump scroll, to attachthe impeller and motor assembly thereto by attaching means carried bythe tool that releases the assembly upon the predetermined placement ofthe tongue portions within the grooved portions thereby permitting thedetent means to retain the tongue portions within the grooved portionseffecting suitable attachment of the motor and impeller assembly to thepump scroll; and is adapted, when 'it is desired to unfasten the,assembly from the pump scroll, to releasethe detent means carried by thepump scroll and attach the impeller and motor assembly thereto byattaching means carried by said tool so that-the tongue portions may bewithdrawn from the grooved portions, thereby unfasterling the motor andimpeller assembly from the pumpscroll. I

It is a further object of this invention to provide a booster pumpscrollwhich is formed with grooved portions adapted to receivecomplementary tongue portions of an impeller and motor assemblywherebythe tongue portions are maintained within the grooved portion bydetent means carried by the shroud;

Another object of this invention is to provide a booster pump motor andimpeller assembly formed with external tongue'portions therewith whichare adapted to be received and retained within complementally formedgrooved portions carried by a pump shroud or scroll.

A still further object of this invention is to provide a booster pumpassembly comprising a pump shroud adapted to receive a motor andimpeller assemblywhere the pump shroud has grooved portionsformed-thereon adapted to receive tongue portions carried by the motorand impeller assembly and the pump. shroud has detent means formaintaining the tongue portions within the grooved portions wherebyactuation ofthe detent means permits either fastening or unfastening ofthe impeller and motor assembly.

Further and more particular objects, uses, and advantages of thisinvention will become apparent froma reading of the following detailedspecification taken in connection with the accompanying drawings forminga part thereof and wherein:

FIGURE 1 illustrates a booster pump assembly according to this inventionmounted within the interior of a fuel tank shown in fragmentary crosssection thereof.

FIGURE 2 is a side view illustrating a device or tool adapted to fastenand unfasten the parts of the booster pump assembly illustrated inFIGURE 1.

FIGURE 3 is a top view of the tool illustrated in FIGURE 2.

FIGURE 4 is a side view of the tool illustrated in FIGURE 2 illustratingin particular the attaching means thereof.

FIGURE 5 is a fragmentary and partially broken away view of FIGURE 4showing the particular structure of the attaching means thereof.

FIGURE 6 illustrates the initial step in attaching an impeller and motorassembly to a pump scroll by means of the tool illustrated in FIGURES 2through 5.

FIGURE 7 illustrates the final step in fastening the impeller and motorassembly to the pump scroll of FIGURE 6.

FIGURE 8 illustrates the unfastening of the impeller and motor assemblyfrom the scroll by means of the tool depicted in FIGURES 2 through 5.

Reference is now made to the drawings wherein like reference numeralsare used throughout to designate like parts, and particular reference ismade to FIGURE 1 where there is disclosed a booster pump assemblyaccording to this invention. The booster pump assembly, generallyindicated by letter A, comprises a motor portion B, an impeller portionC, and a pump shroud or scroll portion D, the motor portion B and theimpeller portion C being formed integrally to comprise a substantiallycylindrical housing cartridge 10. The impeller and motor assembly orcartridge 10 is adapted to be detachably fastened to the pump scroll Din a manner hereinafter to be described.

The pump scroll or shroud D comprises a substantially hollow cylindricalportion 11 having an opening or inlet 12 at one end thereof and a hollowline or outlet pipe 13 connected substantially tangentially to the sideof the cylindrical portion 11 thereby interconnecting the interior ofthe pump scroll D with the interior of the outlet pipe 13. The pumpscroll D is provided with a plurality of outwardly extending flangeportions 14 which are adapted to suitably mount attaching groovedmembers, generally indicated at 15, to be later described. The flanges14 are also adapted to be utilized for mounting the pump scroll D in itsdesired position.

As shown in FIGURE 1, the pump scroll D is mounted inside a fuel tank 16(only-a portion of the tank being shown in cross section) by a pluralityof studs or bolts 17 connected at one end thereof to the interior of thefuel tank 16 and at the other end thereof to the flanged portions 14 ofthe pump scroll D. It should be noted that the pump scroll D, asmounted, has the inlet 12 thereof spaced from the interior surface 18 ofthe fuel tank 16 thereby permitting fuel to flow into the inlet 12. Theoutlet pipe 13 is adapted to pass through a suitable bore (not shown) inthe side of the fuel tank 16 and may be suitably fluid sealed therewith.The outer terminal end of the fuel pipe 13 may be threaded as at 19 toprovide a coupling means for a fuel line leading to a fuel pump or otherutilization device.

The impeller and motor assembly 10 is adapted to be telescopicallyreceived within the hollow pump scroll D and is limited to the extent ofdisposition therein by a flange portion 20 formed intermediate the endsof the cartridge 10 which abuts a complementary flange portion 21 formedon the pump scroll D. In this manner the impeller portion C iscompletely disposed within the interior of the pump scroll D. Thecartridge or impeller and motor assembly is adapted to be fastened tothe pump scroll D in a manner hereafter to be described.

As it is well known in the art to construct a pump or booster pumpassembly which is adapted to be completely submerged within the liquidor fluid to be pumped 4 thereby, the particular details of the operationand structure of the booster pump A need not be described. It issufficient to merely state that the booster pump A has the motor portionB so formed as to be adapted to operate while submerged in fluid and isadapted to be suitably connected to an electrical power source (notshown) by the electrical lines indicated generally at 22.

Although the entire fuel tank structure 16 is not shown, there is,nevertheless, provided an access opening therein in any suitable portionthereof which is adapted to permit the passage of the cartridge assembly10 therethrough in addition to the special tool device attached theretolater described. The access opening is provided with a suitable accessplate cover to provide a sealed closure therefor. The preferred positionof the access opening would be in the top of the fuel tank at a pointsubstantially coaxial with the axis of the pump scroll.

The impeller and motor assembly 10 is provided with a pair of opposedabutment portions 23 intermediate the ends thereof disposed at apredetermind distance from the end 24 of the flange portion 20. Theseabutments 23 are so formed as to be complementary to the fastening andunfastening device or tool now to be described.

As shown in FIGURES 2 to 5, the fastening and unfastening tool,generally indicated by the letter E, comprises an attaching portion F, ahandle or holding portion G, and a grasping and turning portion H. Theattaching portion F comprises a pair of arcuately-shaped side members 25connected at one end thereof to an of metal or any other material havingproperties suitable for this use. Further, this end section 26 and sidesections 25 may be formed integrally, such as by casting, or in separatepieces and ridigly secured togther as previously described.

The end section 26 is provided with an outwardly extending flangeportion 27 at substantially the center of the end section 26 and iscentrally bored and adapted to receive one end of the shaft or handle 28which is retained therein by a pin or rivet 29 passing axially throughthe flange portion 27 and the handle 28. The other end of the handle 28may be provided with the grasping or turning member H.

A cradle or telescoped member 30 is centrally bored at 31 and isadapated to be telescopically disposed about the handle 28. A helicalspring 32 is disposed about the handle 28 and has one end thereofengaging the flange portion 27 of the end section 26 and the other endthereof engaging the telescoped member 30 whereby the spring 32 tends tomaintain the telescoped member 30 spaced from the end section 26 at apredetermined distance against a stop member 33 suitably fastened to thehandle 28. In this manner the telescoped member 30 is urged against thestop 33 by the spring 32 for a first position thereof. The telescopedmember 30 is adapted to be movable relative to the handle 28 toward theend section 26 of the attaching means F in opposition to the force ofspring 32. An outwardly extending flange portion 34 formed integrallywith the telescoped member 30 is provided with a bore 35 adapted tohouse a latching pin 36 which passes through a counterbore 37 formed inthe end 38 of the flange portion 34. The pin 36 is provided with anenlarged portion 39 intermediate the ends thereof which is disposedcompletely within the bore 35. A spring 40 is telescoped about the pin36 within the bore 35 and has one end thereof engaging the enlargedportion 39 and the other end thereof abutting the end wall 41 of thebore 35 thereby tending to urge the pin 36 toward the handle 28. Thehandle 28 is provided with a counterbore or notch 42 at a predeterminedpoint therein which is adapted to receive the end 43 of the pin 36 whenthe telescoped member 30 is moved a sufficient distance toward the endsection 26 of the attaching portion F. In this manner when thetelescoped member 30 is so positioned relative to the handle 28 inopposition to the spring 32, the end 43 of the pin 36 is urged into thecounterbore 42 by the force of spring 35, thereby maintaing thetelescoped member 30 in a second position thereof. If it is desired toreturn the telescoped member 30 against the stop 33, the end of the pin36 is provided with a cross pin 44 which is adapted to be pulled to theright to retract the end 43 from the counterbore 42 and the spring 32moves the telescoped member 30 from the second position to the first postion thereof against the stop 33.

Each side section is provided with a longitudinal bore 45 passingthrough the left portion thereof from the fixed ends thereof through thefree ends 46 thereof. A shaft 47 is disposedwithin each bore 45 and hasthe upper end 48 thereof suitably threaded and adapted to passthrough abore 49 formed in one of the outer ends of the telescoped member and besuitably fastened thereto by a retaining nut 50. As illustrated in thefigures, the tool E is shown as having only two side sections 25 and,therefore, only two shafts 47, one for each side section 25, However,any number could be provided.

The free ends 51 of the shafts 45 are provided with an enlarged buttonportion 52 and are so formed that when the telescoped member 30 is inits first position against stop- 33 the free ends 51 of the shafts 47are substantially adjacent the free ends 46 of the side sections 25.When the telescoped member 30 is moved to its second position, shafts 47are adapted to have the free ends 51 thereof project a predetermineddistance beyond the free ends 46 of the side sections 25 depending uponthe distance the telescoped member 36 is moved toward the end section26. This position of the shafts 47 is shown in dotted lines in FIGURE 4.

Each side section 25 is provided with an elongated slot 53 at the freeends 46 thereof. The slots 53 have an opened end 54 adjacent the freeends 46 thereof and a closed portion 55 intermediate its ends.

Reference is now made to FIGURE 5 illustrating the particular attachingmeans adapted to cooperate with the slots 53 to provide an attachingmeans, the purpose of which will be later described. As shown, the sidesections 25 are each provided with a cut out portion or chamber 56 whichis substantially larger than the slot 53. In this manner the cut outportion 56 is overlapped by, front and back portions, 57 and 58respectively, of the side section 25 which portions define the slot 53.The free, ends 46.of the side sections 25 are also provided with cut outportions 59 throughout the entire arcuate width thereof. The cut outportions 56 thereby provide chambers within the interior of the sidesections 25. In each chamber or cut out portion 56 a pivotal latchmember 60 is mounted on the overlapping back portion 58, and overlappingfront portion 57 by means of a rivet or pin 61 passing therethrough insuch a manner that the distance from the pivot 61 to the end 62 thereofis substantially greater than the distance from the pivot 61 to theother end 63 thereof. The end 62 of the latch member 66 is normallyurged to the right, as viewed in the drawings, by means of a wire spring64 coiled about a rivet or pin 65 having one end 66 thereof abuttingagainst the side of the cut out portion 56 and the other end 67 thereofengaging the end 62 0f the latch member. 66

The closed ends 55 of the slots 53 each have a bearing plate 68 fastenedbetween the front and back portions 57' and 58 thereof by means of ascrew 69 passing through a bore in the plate 68 and being suitablythreadedinto the side section 25 at 70, thereby closing off the chambers56 at the closed ends 55 of the slots 53 from the ends 71 of thechambers 56. Each of the side sections 25 is provided with a secondlatch member 72 that is pivotably mounted to the front and backoverlapping portions 57 and 58 by means of a pin or rivet 73 and has anelongated curved portion 74 disposed adjacent the sides of the slot 53.Each second latch member 72 is urged to the left by a wire spring 75coiled about a rivet or pin 76 whereby the end 77 thereby abuts the edgeof the chamber 56 and the other end 78 thereof engages the second latchmember 72. It should be noted that the latch members 60 have the ends 62thereof spaced from the bearing plates 68 and are normally exposedwithin the slots 53. The purpose for the attaching means in the sidesections 25 comprising the slots 53 and latch members 60 and 72 will nowbe described.

Reference is now made to FIGURES 6 through 8 which illustrate theparticular utilization of the tool E in combination with the boosterpump assembly A previously described. The arcuate and spaced sidesections 25 of the tool E are adapted to be telescoped about thecylindrical cartridge or impeller and motor assembly 10 whereby eachopposed abutment 23 thereof is adapted to be telescoped by a respectiveslot 53 in the side sections 25 upon the telescoping of the tool E aboutthe assembly 10. As the side sections 25 are passing over the cartridge10, the abutments 23 thereof cam the latch members 72 and 60 against theurging of their respective springs to the right and left respectively,thereby permitting the abutments 23 to engage the bearing plates 68.Upon engagement of the plates 68 by the abutments 23, the latch members60 are free to pass under the abutments 23 by moving to the right underaction of the springs 64, thereby suitably attaching the cartridge 10between the side sections 25. It should be noted that the telescopedmember 30 is in its first position whereby the free ends 51 of theshafts 45 are substantially adjacent the free ends 46 of the sidesections 25.

As shown in FIGURE 6, the cartridge. 10 has been attached to the sidesections 25 by means of the slots 53 and latch members 60. When it isdesired that this cartridge 10 be fastened to a pump scroll D mountedwithin a fuel tank 16, the mechanic takes hold of the handle G at thegrasping end H thereof and inserts the tool and attached cartridge 10through the access opening in the fuel tank and lowers the cartridge 10through the liquid contained therein, if present, into a positionrelative to the scroll as shown in FIGURE 6. It should be understoodthat-by merely rotating the tool E and cartridge 19 relative to the pumpscroll D, the particular positioning of the impeller and motor assembly10 relative to the pump scroll D may be obtained without the necessityof visual inspection by the workman as the pump scroll D and cartridge16 are so designed that the cartridge 1%) will only assume the positionillustrated in FIGURE 6 before the cartridge 10 may be fastened to thepump scroll D. If, in the initial telescoping of the cartridge 10within, the pump scroll D assumes any other position than thatillustrated in FIG- URE 6, the workman, in rotating the tool E clockwiseand subsequently its cartridge 19, causes the cartridge 10 to assume theposition as in FIGURE 6, whether he realizes it or not, and furtherrotation of the cartridge lu-causes the cartridge 10 to become fastenedto the pump scroll D in a manner to be described.

It may be desired to provide some guide means to assure that thecartridge 14) is being placed in the desired position relative to thescroll D, and such means are illustrated in FIGURE ,1. A substantiallycylindrical member 80 made of sheet metal or other suitable material isconcentrically disposed about the pump scroll D permitting the passageof the tool E and cartridge 10 therethrough. The outer end 81 of thecylindrical guide member 86 may be flared outwardly to furtherfacilitate its guiding purpose.

The grooved portions of the scroll D generally referred to heretoforewill now be described. The grooved portions 15 comprise anarcuately-shaped member, formed either integrally with the pump scroll Dor separately and rigidly attached thereto at the outer edge of theflange portion 21 thereof, each having a substantially taperinghorizontal slot 82 formed therein. These slots 82 are each adapted tocomplementarily receive an external tongue portion 83 formed on theexterior of the cartridge 10 at the flange portion thereof. As shown inthe drawings, only two grooved portions 15 are illustrated and thereforeonly two tongue portions 83 are illustrated.

As shown in FIGURE 6, when the cartridge 10 has been placed within thepump scroll D, the free ends 46 of the side sections of tool E arepositioned just above the grooved portions 15, and the tongue portions83 of the cartridge 10 are in a position where, upon clockwise rotationof the cartridge 10, the tongue members 83 are adapted to be received inthe grooves 82. The flange portion 21 of the pump scroll D is providedwith a plurality of detent means each of which comprises a bulletshapedpin 84 disposed in a bore 85 formed in the flange portion 21 and isadapted to project above the flange portion 21 at a point adjacent theopening of the slot 82 by means of a spring 86 acting against the pin84. The spring 86 is disposed within the bore 85 formed Within theflange portion 21 of the pump scroll D and engages the pin 84 at one endthereof and engages the bottom of the bore 85 at the other end thereof.The detent pin 84 is adapted to be telescopically received within thebore 86 when sufficient force is applied at the projecting end thereofovercoming the opposition force of the spring 85.

The tongue portions 83 are so formed that they have tapering sideportions 87 at the forward end 88 thereof which provide camming surfaceson the tongue portions 83. In this manner when the cartridge 10 isplaced in the position as shown in FIGURE 6 and upon clockwise rotationthereof to the position shown in FIGURE 7, the camming portions 87 ofthe tongue portions 83 cam the detent pins 84 into their respectivebores 85 so that the tongue portions 83 may enter and substantially fillthe respective grooves 82 of the grooved portions 15 of the pump scrollD.

Arcuate actuating members 89 are suitably positioned and fastened to thegrooved portions 15 on the upper sides thereof. Upon clockwise rotationof the tool E, from the FIGURE 6 position to the FIGURE 7 position, theactuating members 8? are adapted to enter the cut out portions 59 of theside sections 25 and abut against the ends 63 of the latch members 60,thereby causing the latch members 60 to rotate about the pivots 61 tothe left moving the latching ends 62 from under the abutments 23 of thecartridge 10. In this manner the tool E is adapted to be released fromthe cartridge 10, untelescoped therefrom, and removed from the fuel tank16. The impeller and motor assembly 10 is thus securely fastened to thepump scroll D by the pins 84 which now project above the flange portion21 and retain the tongue portions 83 of the cartridge It) in the grooves82 of the grooved portion 15 of the pump scroll D.

When it is desired to remove the cartridge 10, fastened to the pumpscroll D in the above described manner, the mechanic or workman movesthe telescoped member to its second position, and the latching pin 43retains the telescoped member in in this second position in the mannerpreviously described whereby the free ends 51 of the shafts 45 areextended and project a predetermined distance from the free ends 46 ofthe side members 25. The tool E is inserted within the fuel tank 16 and,as shown in FIGURE 8, the attaching portion F of the tool E istelescoped about the fastened cartridge 10. If the slots 53 in the sidesections 25 are not in alignment with the abutments 23 of the cartridge10 in the initial telescoping of the tool E about the cartridge 10, theworkman in rotat- 8 ing the tool E causes the slots 53 to come into thatalignment. This alignment condition, obviously, does not require visualinspection by the workman nor any particular skill thereof as theworkman, in the unfastening of the cartridge 10 from the pump scroll D,must rotate the tool counterclockwise anyhow. The abutments 23, beingtelescoped by the grooves 53 formed in the side sections 25, cam thelatch members 60 to the left and the latch members 60 are retained inthe left position by the actuating members 89 when the attaching portionF of the tool E is in its fully telescoped position as shown in FIGURE8. In this fully telescoped position, the button portions 52 of theshafts are in such a position that the detent pins 84 are telescopedwithin the bores 85 of the pump scroll D whereby the tongue portions 83of the cartridge may be withdrawn from the grooves 82 of the groovedportions 15 of the scroll D upon counterclockwise rotation of the tool Eand cartridge 10. As the tool E and cartridge 10 are rotatedcounterclockwise, the latch members are permitted to be pivoted to theright under urging of springs 64 as the ends 63 thereof becomedisengaged from the actuating members 89. The end portions 62 of thelatch members 60 moving to the right suitably retain the abutments 23within the slots 53. When the cartridge 10 has been sufficiently rotatedcounterclockwise so that the tongue portions 83 are completely withdrawnfrom the grooves 82, the cartridge 10 may be withdrawn from the fueltank.

As can be seen from the above description, there has been disclosed atool that permits relatively easy fastening and unfastening of a motorand impeller assembly to or from a pump scroll, where the scroll ismounted within a fuel tank, without requiring the lowering of the liquidlevel contained therein to permit observation thereof by the persondesiring to fasten or unfasten the assembly.

Further, this invention provides a unique arrangement whereby a motorand impeller assembly is adapted to be fastened and unfastened to ascroll with a minimum of time and effort.

While reference has been made to right and left positions, clockwise andcounterclockwise rotation, and upper and lower positions of the variousparts of this invention, it is to be understood that this is only forthe purpose of facilitating an understanding of the specific embodimentsillustrated in the drawings and referred to in the above detaileddescription and is not intended to provide any limitations to thisinvention.

Further, while this invention has been described in connection withcertain specific embodiments thereof, it is to be understood that thisis by way of illustration and not by way of limitation, and the scope ofthis invention is defined solely by the appended claims which should beconstrued as broadly as the prior art will permit.

What is claimed is:

1. A fluid pump assembly comprising: a motor and impeller assembly; aplurality of tongue portions formed on said motor and impeller assembly;a hollow scroll member, said scroll member being adapted totelescopically receive said motor and impeller assembly whereby saidimpeller is disposed within said hollow scroll member; means defining aplurality of grooved portions formed on said scroll member, said groovedportions adapted to complementarily receive said tongue portions whensaid motor and impeller assembly is telescopically received in saidscroll member in a predetermined position thereof; and a plurality ofdetent means carried by said scroll member, each of said detent meansbeing positioned adja cent each of said grooved portions and adapted toretain the respective tongue portions Within the respective groovedportions whereby said motor and impeller assembly is fastened to saidscroll member.

2. A scroll member for a fluid pump assembly comprising: a substantiallycylindrical hollow member having opposed open ends, one of said openedends adapted to provide a flow passage for fluid entering said scrolland 9 the other of said opened ends adapted to telescopically receive animpeller portion of a motor and impeller assembly; means defining aplurality of grooved portions formed on said hollow member adjacent saidother of said opened ends, said grooved portions adapted tocomplementarily receive tongue portions formed on said motor andimpeller assembly when said motor and impeller assembly istelescopically received in said hollow member; and a plurality of detentmeans carried by said hollow member, each of said detent means beingposi- 10 2,936,095

10 tioned adjacent said other of said opened ends and adapted to retainthe respective tongue portion within the respective grooved portionswhen said motor and impeller is telescopically received in said hollowmember in a 5 predetermined portion thereof.

References Cited in the file of this patent UNITED STATES PATENTS NarnurMay 30, 1961

1. A FLUID PUMP ASSEMBLY COMPRISING: A MOTOR AND IMPELLER ASSEMBLY; APLURALITY OF TONGUE PORTIONS FORMED ON SAID MOTOR AND IMPELLER ASSEMBLY;A HOLLOW SCROLL MEMBER, SAID SCROLL MEMBER BEING ADAPTED TOTELESCOPICALLY RECEIVE SAID MOTOR AND IMPELLER ASSEMBLY WHEREBY SAIDIMPELLER IS DISPOSED WITHIN SAID HOLLOW SCROLL MEMBER; MEANS DEFINING APLURALITY OF GROOVED PORTIONS FORMED ON SAID SCROLL MEMBER, SAID GROOVEDPORTIONS ADAPTED TO COMPLEMENTARILY RECEIVE SAID TONGUE PORTIONS WHENSAID MOTOR AND IMPELLER ASSEMBLY IS TELESCOPICALLY RECEIVED IN SAIDSCROLL MEMBER IN A PREDETERMINED POSITION THEREOF; AND A PLURALITY OFDETENT MEANS CARRIED BY SAID SCROLL MEMBER, EACH OF SAID DETENT MEANSBEING POSITIONED ADJACENT EACH OF SAID GROOVED PORTIONS AND ADAPTED TORETAIN THE RESPECTIVE TONGUE PORTIONS WITHIN THE RESPECTIVE GROOVEDPORTIONS WHEREBY SAID MOTOR AND IMPELLER ASSEMBLY IS FASTENED TO SAIDSCROLL MEMBER.